Question

A screen containing two slits 0.1 mm apart is 2.0 m from the viewing screen. Light of wavelength 500 nm falls on the slits from the distance source. Approximately how far are adjacent bright fringes on the screen? Give answer in mm.

Answer 1

Intim 1 d given, 9 1 = - 500X10m L 2m d = 0.1x103 m Y Y 500x10 (2) 3 is mt m O.IXI0 3 & Ymti Ym = 0.01 m

solution or or method 2 d sing = ml (0) (500X10 ×10 9) Sinan hid d 3 0-1X10 Sin e o The first order foringe (m=1) occur. at x distance from Center of screen X tano, x 0, 3 x = LO L x = (2) 500x10 9 O.1X 10 3 O olm Similarity e for m=2 x₂ = LO 2 m d Xi 500X10 X2 10.02m 0.1 X 10

are at Hence the bright fringes separation of X-ni 0.0lm